I went back to my notes and found that the problem with the batteries wasn't melting, but leaking on the higher charge rate (they did get pretty hot).
The red insulating paper at the end of some batteries were darkenning up due to internal leakage. I reported this and they were replaced, with the recomendation to use the lower charging rate.
The original battery packs had clear heat-shrink, so you could see this problem.
The newer ones now have black heat-shrink....
Unfortunately this masks any potential problem indicator
Phil.
Quote:
Originally Posted by Techhexium
Well, I only been in FTC for two years, and my team charges the two batteries we have at the higher rate and we never had any melting problems before, and the batteries have been used for two seasons. Maybe we're just lucky, but I'll start charging them at 0.9A because it's off-season for every team in CA and it helps preserves the battery's life.
However, a couple months ago the batteries' fuses blown, but we replaced the fuses and fixed our wiring and they still work.
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__________________
Phil Malone
Garrett Engineering And Robotics Society (GEARS) founder.
http://www.GEARSinc.org
FRC1629 Mentor, FTC2818 Coach, FTC4240 Mentor, FLL NeXTGEN Mentor